Maybe you could sound out a sempai first about how gradings are generally done at your dojo? At some places it's not considered appropriate to ask to be graded, but that varies from dojo to dojo.

I'd agree Pauliina. In our paricular dojo we don't ask to grade. If we did we would probably be passed over for that grading cycle. The closest we can really get is asking what we should work on to be included in the next round of grading.
Conversely I know there're instructors in our association who want their students to ask. Find out from a sempai how it works in your dojo and proceed from there.

Bronson

"A pacifist is not really a pacifist if he is unable to make a choice between violence and non-violence. A true pacifist is able to kill or maim in the blink of an eye, but at the moment of impending destruction of the enemy he chooses non-violence."